1237results about "Hydroxy compound separation/purification" patented technology

The invention discloses a high-performance composite solvent-resistant nanofiltration membrane with a rigid twisted non-planar structure polyamide layer and a preparation method of the high-performance composite solvent-resistant nanofiltration membrane. The preparation method comprises the steps of preparation of the rigid twisted non-planar structure polyamide layer and surface modification. A water phase solution containing adamantane diamine and m-phenylenediamine and an organic phase solution containing 1, 3, 5-trimesoyl chloride and acetone are subjected to interfacial polymerization reaction to prepare a polyamide layer with a rigid twisted non-planar structure, and then a polyphenol modifier is used for carrying out hydrophilic modification on the polyamide layer, so that the rigid twisted non-planar structure is obtained. The pure water permeability and retention rate of the solvent-resistant nanofiltration membrane are obviously improved; due to the introduction of adamantane diamine, the interfacial polymerization process and the formation of a polyamide layer are remarkably regulated and controlled, and the separation performance of the solvent-resistant membrane is greatly improved on the premise that the interception performance of the membrane is hardly reduced; the preparation process is simple, and the prepared membrane is excellent in performance and has a good application prospect in the aspect of organic solvent separation.

The invention discloses a citron and cichorium intybus composite solid beverage, and relates to the technical field of solid beverages, and the solid beverage comprises the following components: 20-30 parts of a citron extract, 50-70 parts of a cichorium intybus extract, 5-10 parts of erythritol, 1-2 parts of vitamin C, 1-2 parts of probiotic powder, 1-2 parts of citric acid, and 1-2 parts of ginger powder. According to the citron and cichorium intybus composite solid beverage, the cichorium intybus extract in the citron and cichorium intybus composite solid beverage is rich in dietary fibers and can help to improve intestinal health and promote digestion, citron and cichorium intybus contain rich antioxidant components and are beneficial to neutralizing free radicals and slowing down the aging process, and the components in the beverage can help to improve energy and promote digestion. The physical and mental states are improved.

The invention relates to the technical field of chemical engineering, in particular to a method and a device for removing heavy components from cyclohexanol. Comprising the following steps: a, rectifying a cyclohexanol-containing material from a cyclohexene hydration reaction to obtain a first solution containing cyclohexanol and heavy components in a tower kettle; b, carrying out heavy component removal operation on the first solution to obtain a third solution containing a catalyst and heavy components, a first gas phase and a second gas phase; and c, rectifying the first gas phase and the second gas phase to obtain a fourth solution subjected to heavy component removal, namely cyclohexanol subjected to heavy component removal. The entrained catalyst and heavy components are removed together, and the fluidity required by the catalyst waste liquid is maintained by using the heavy components, so that the loss of cyclohexanol is reduced.

The invention relates to the technical field of purification of organic chemicals, in particular to an aroma purification method of leaf alcohol. Comprising the following steps: preparing a methanesulfonic acid magnetic catalyst; esterification of leaf alcohol; and alcoholysis and fractionation of the esterification solution. According to the method, acetic acid is used for esterification of leaf alcohol, then clear water and a sodium carbonate solution are used for washing, the clear water can effectively remove some water-soluble impurities and acidic byproducts, and the sodium carbonate solution not only can neutralize residual acidic substances, but also can promote siloxane impurities in initial leaf alcohol to be hydrolyzed and then taken away by a water phase, so that the content of the siloxane impurities in the leaf alcohol is reduced; in the subsequent process of producing leaf alcohol through alcoholysis of the organic phase I, pure water and ethanol, silyl ether impurities are hydrolyzed in a high-temperature and strong-alkali environment, products are dissolved in waste liquid to be removed, olefine aldehyde impurities with the boiling point lower than that of leaf alcohol are removed through azeotropic fractionation with ethanol, in conclusion, the impurities in the finished product leaf alcohol can be effectively reduced, and the yield of the finished product leaf alcohol is increased. And the prepared finished product leaf alcohol is high in purity and pure in fragrance.

The invention relates to the technical field of ethylene glycol purification, and discloses a purification method of an ethylene glycol solution, a membrane separation device and application of the membrane separation device. The purification method comprises the steps that (1) an ethylene glycol solution is fed for purification treatment, a purification system comprises a membrane separation device composed of a booster pump and a first membrane assembly, and the first membrane assembly at least comprises an I-1 membrane set, an I-2 membrane set and an I-3 membrane set and is used for intercepting ethylene glycol and metal ions; (2) the obtained primary concentrated solution of the purification system is subjected to concentration treatment, a concentration system comprises a membrane separation device composed of a booster pump, a circulating concentration water tank II-1 and a membrane separation assembly II-2 membrane, the II-2 membrane intercepts one or more of monovalent ions, divalent ions and trivalent ions, and purified ethylene glycol clear liquid is obtained. The method is energy-saving and easy to implement, is suitable for purifying the low-concentration ethylene glycol solution, and has a very good industrial application prospect.

The invention relates to the technical field of eutectic crystals, in particular to a lutein and mannitol eutectic crystal as well as a preparation method and application thereof, an XRD (X-Ray Diffraction) pattern of the eutectic crystal has characteristic diffraction peaks at least at positions where 2 theta angles are 9.71 degrees, 19.44 degrees, 20.4 degrees, 21.17 degrees, 22.07 degrees, 24.67 degrees, 25.32 degrees, 36.1 degrees, 40.39 degrees and 44.9 degrees, and error tolerance of + / -0.2 degrees exists; a characteristic endothermic peak exists at 163.7 DEG C in a DSC spectrum, and an error tolerance of + / -0.2 DEG C exists; the preparation method comprises the following steps: respectively dissolving mannitol and xanthophyll in water and absolute ethyl alcohol, mixing, carrying out high-temperature and high-pressure reaction, standing, crystallizing, filtering, spray-drying and grinding to obtain the eutectic crystal, and the eutectic crystal can be applied to cosmetics, health-care products, foods and medicines. The eutectic crystal provided by the invention has the advantage of good stability.

The invention belongs to the technical field of chemical engineering, and particularly relates to an aluminum alkoxide salt and a preparation method thereof. According to the method, argon non-thermal plasma is adopted for bombarding the surface of the aluminum foil, an oxidation film on the surface of the aluminum foil is stripped, active aluminum free radicals are formed, the reaction energy barrier of the aluminum alkoxide salt is reduced, the aluminum alkoxide salt can be synthesized under the catalyst-free condition, and green and efficient synthesis of the aluminum alkoxide salt is achieved; a thiosemicarbazide-carboxylic acid bidentate ligand is adopted for complexing impurity iron in alkoxide aluminum salt, sulfur and nitrogen double coordination sites in a thiosemicarbazide unit are matched with oxygen coordination sites in a carboxylic acid group, higher complexing capacity is formed for the impurity iron, and the stability of the complex is improved; the crystallization is regulated and controlled through the pH response characteristic of the carboxylic acid group, so that the impurity iron in the aluminum alkoxide salt is efficiently removed.

The invention relates to the field of biomass energy and chemical industry, in particular to an efficient methanol preparation method based on biomass graded catalytic conversion and cycle coupling. The method comprises the following steps: in a graded catalytic oxidation reaction system, mixing a biomass raw material with a composite vanadium-based catalyst, water, oxygen and circulating methanol for reaction to generate a gas-liquid mixture containing methyl formate; recycling methyl formate by using a gradient variable-pressure rectification separation system; carrying out an interface hydrogenation reaction under the action of a copper-zinc-LTA hierarchical pore catalyst to generate methanol; finally, part of methanol is purified and recycled through membrane separation. The method realizes efficient conversion from biomass to methanol, has the advantages of mild reaction conditions, low energy consumption, high yield and good catalyst stability, and opens up a new path for industrialization of preparation of methanol from biomass.

The present disclosure is directed to methods and systems of purifying solvents. The purified solvents can be used for cleaning a semiconductor substrate in a multistep semiconductor manufacturing process.

Disclosed herein are systems and embodiments for improving energy efficiency of a chemical separations plant through heat integration. Heat integration may provide heating loops between distillation columns and / or integrated electric heating components configured to supply heat to reboilers in the chemical separations plant. Heat integration may use heat from an associated chemical synthesis plant configured to carry out an exothermic reaction (e.g., production of methanol from CO2 and H2). Such integrated process designs allow for the use of “low-grade” heat, thereby improving energy efficiency. Furthermore, such integrated process designs allow for electrification of exemplary chemical separations plants, replacing the use of steam as a heating medium with more energy efficient and carbon-emission neutral, electrical methods.

The invention relates to a lignin-based polymer pervaporation membrane, a preparation method thereof and a method for separating and purifying cyclohexane-KA oil. The invention aims to provide a pervaporation membrane which is high in permselectivity, high in stability and good in mechanical property. The pervaporation membrane is used for cyclohexane-KA oil separation and has the advantages of high separation efficiency, low energy consumption and simple process. The preparation method comprises the following steps: adding the surfactant, the polymer and the solvent into a reactor, and stirring at 50-70 DEG C for 4-6 hours to obtain a mixed solution; the method comprises the following steps: adding lignin and a solvent into a reactor, and stirring at room temperature for 4-6 hours to obtain a lignin solution; dropwise adding the lignin solution into the mixed solution, and continuously stirring at constant temperature for 12-24 hours to obtain a membrane casting solution; transferring the membrane casting solution to a centrifugal tube, performing centrifugal separation, and uniformly coating the membrane casting solution on an ultrafiltration membrane material with the membrane thickness of 100-200mm to form a uniform liquid membrane; and drying the liquid membrane to obtain the lignin-based polymer pervaporation membrane. Belongs to the technical field of membrane separation.

Crystalline polymorphic lutein and cocrystal forms of lutein are disclosed. The new forms have enhanced bioavailability and stability, and may be used, for example, for topically delivering lutein to the eye for inhibiting or preventing cataracts, macular degeneration, and photooxidative damage to retinal pigment epithelium.

A gas separation method includes supplying a mixed gas to a zeolite membrane complex and permeating a high permeability gas through the zeolite membrane complex to separate the high permeability gas from other gases. The mixed gas includes a high permeability gas and a trace gas that is lower in concentration than the high permeability gas. The molar concentration of a first gas included in the trace gas in the mixed gas is higher than the molar concentration of a second gas included in the trace gas in the mixed gas. The adsorption equilibrium constant of the first gas on the zeolite membrane is less than 60 times that of the high permeability gas. The adsorption equilibrium constant of the second gas on the zeolite membrane is 400 times or more that of the high permeability gas.

The invention relates to a method for producing high-purity electronic-grade methanol by using industrial-grade methanol. The method comprises the following steps: removing organic impurities and water in a methanol raw material through primary rectification, carrying out microfiltration to preliminarily remove particle impurities, removing zwitterions, carrying out secondary rectification to further remove organic impurities and water, and carrying out nanofiltration to further remove particle impurities. Compared with the prior art, the method has the advantages of high product purity, high process yield, low impurity content, strong process continuity and the like, and the produced electronic-grade methanol product meets SEMI C12 and above standards, so that the method has a relatively strong industrial prospect.

The invention discloses a separation and preparation method of D-chiro-inositol, and relates to the technical field of D-chiro-inositol production, a D-chiro-inositol conversion liquid is subjected to thallus removal, deproteinization, desalination and concentration, then ethanol is added for primary separation, ethanol is added again for crystallization after dealcoholization, D-chiro-inositol is purified, and the D-chiro-inositol is obtained. The ethanol is an inert solvent, more chiral inositol in the solution can be crystallized by adding the ethanol, the yield is increased, after the ethanol is added, the viscosity of a crystallization system is reduced, the flowability of the system is better, the crystal can grow more uniformly during crystallization, the crystal is more uniform, and the purity of the product is improved. And the quality of the D-chiro-inositol is improved.

This invention discloses a system and method for producing methanol by carbon dioxide hydrogenation. The system includes a feedstock turbine compressor, a first feedstock gas heat exchanger, a second feedstock gas heat exchanger, an adiabatic reactor, an isothermal reactor, a gas-liquid membrane separator, and a molecular sieve. By setting up an isothermal reactor and utilizing the heat from the product produced by the adiabatic reactor in separate streams, heat coupling between the two reactors is achieved. The unreacted feedstock gas remaining after the adiabatic first-stage reaction is circulated in the isothermal reactor, reducing the size requirements of the adiabatic reactor and improving the overall conversion rate of carbon dioxide. This application solves the problems of high energy consumption in the distillation of by-product water in the carbon dioxide hydrogenation to methanol process, large investment in traditional equipment, serious heat loss, and excessive circulating gas volume in existing technologies.

According to the method, industrial-grade 1, 2-propylene glycol co-produced by a dimethyl carbonate process through a transesterification method is taken as a raw material, and purification processes of activated carbon adsorption impurity removal, deodorant impurity removal and rectification impurity removal are carried out, so that various indexes such as chromaticity, odor, purity and ultraviolet light transmittance of the obtained 1, 2-propylene glycol product reach the quality indexes of an imported pharmaceutical-grade 1, 2-propylene glycol product. According to the method disclosed by the invention, the pharmaceutical grade propylene glycol can be prepared with high quality, and a good development prospect and huge economic benefits are undoubtedly brought to the propylene glycol industry.

The invention relates to the field of chemical separation and purification, in particular to a method for separating a tetrahydrofuran / methanol / water mixture through reactive extractive distillation. Comprising the following steps: water reactive distillation separation, tetrahydrofuran extractive distillation or low-pressure extractive distillation separation, and methanol extractive distillation separation. Heat exchange is carried out between the water reactive distillation tower or the methanol extractive distillation tower and the tetrahydrofuran extractive distillation low-pressure tower, so that partial heat integration is realized; wherein in the reactive distillation tower, water and ethylene oxide react to generate ethylene glycol with high utilization value. After a dimethyl sulfoxide material flow serving as an extracting agent at the bottom of the methanol extractive distillation tower flows out, the dimethyl sulfoxide material flow can flow back to the tetrahydrofuran extractive distillation tower or the tetrahydrofuran extractive distillation low-pressure tower after being cooled by a cooler and supplemented with the extracting agent. The molar purity of ethylene glycol obtained through separation can reach 99.9% or above, the molar purity of tetrahydrofuran and methanol can reach 99.5% or above, the product recovery rate is high, the process is simple, and energy consumption is low.

The invention relates to the technical field of metal organic framework new materials, in particular to a crystalline metal ring film and a preparation method and application thereof.The crystalline metal ring film is formed by self-assembly of metal ligands and organic ligands through interface coordination, a film body of the crystalline metal ring film has crystallinity, pore channels formed by the metal ligands and the organic ligands are of an ordered structure, and the crystalline metal ring film can be used as a crystalline metal ring film. The molecular interaction of crystalline metal ring film molecules and chiral compounds and the transmission of chiral molecules are facilitated. Besides, the thickness of the crystalline metal ring film prepared through an interface coordination method is about 100 nm, the thickness of the mixed matrix film prepared through the preparation method provided by the prior art is about 43 microns, and the thickness of the mixed matrix film is obviously reduced compared with that of the mixed matrix film in the prior art. The crystalline metal ring membrane provided by the invention is coherent and defect-free in membrane body, the channel of the crystalline metal ring membrane greatly improves the transmission rate, and the crystalline metal ring membrane is expected to be applied to separation and / or detection of chiral compounds.

The present invention discloses a production device and method for ultra-high-purity methanol, comprising a heater, a distillation device, a first filter membrane, a second filter membrane, and a third filter membrane, wherein the first inlet of the first filter membrane is connected to the first outlet of the heater, and the first retentate side of the first filter membrane is connected to the first inlet of the distillation device; the second inlet of the second filter membrane is connected to the top outlet of the distillation device, and the second retentate side of the second filter membrane is connected to the first inlet of the distillation device; the second permeate side of the second filter membrane is connected to the third inlet of the third filter membrane, and the retentate side of the third filter membrane is connected to the second inlet of the second filter membrane. The present invention can further improve low-purity methanol or high-purity methanol to ultra-high-purity methanol, and the product purity of ultra-high-purity methanol is high.

The invention relates to the technical field of glycerol purification, in particular to a high-purity glycerol deep purification process which comprises the following steps: adding methanol and phosphoric acid into crude glycerol to prepare pretreated glycerol; adding a composite alkali solution into the pretreated glycerol, standing and layering to obtain a clear liquid phase, adding activated carbon and stirring, and injecting filtrate into an ion exchange column after centrifugal separation; distilling the liquid flowing out of the ion exchange column to obtain semi-treated glycerol; and sequentially carrying out reduced pressure distillation and activated carbon deodorization and decolorization treatment on the semi-treated glycerol to obtain the high-purity glycerol. According to the method, methanol and phosphoric acid are firstly used for treatment, separation of glycerol is facilitated, salt is sufficiently separated out by adding a composite alkali solution, impurities in crude glycerol can be well adsorbed and removed by matching with added activated carbon, and non-electrolytic substances of the crude glycerol are adsorbed and fixed under the assistance of ion exchange resin, so that further purification is realized; finally, methanol and water are removed through distillation / reduced pressure distillation, and the purity of the obtained glycerol can reach 99.9%.

The utility model provides a methanol energy-saving recovery device for sodium methoxide production, the methanol energy-saving recovery device comprises a reaction tower, a rectifying tower, a negative pressure tower, a secondary pressurizing tower and a pressurizing tower which are connected in sequence, a part of refined methanol gas phase at the top of the rectifying tower provides heat for a tower kettle of the reaction tower after being compressed, and a part of refined methanol gas phase provides heat for a rectifying tower reboiler after being compressed; a refined methanol gas phase at the top of the secondary pressurizing tower provides heat for a reboiler of the negative pressure tower; a refined methanol gas phase at the top of the pressurizing tower provides heat for a secondary pressurizing tower reboiler; an innovative efficient energy-saving technology is adopted, the recovery efficiency of methanol is remarkably improved, energy consumption is reduced, the overall production process is optimized, the mature reaction tower, rectifying tower, negative pressure tower, secondary pressurizing tower and pressurizing tower are adopted as equipment, the structure is simple, and then the installation, debugging and maintenance difficulty of the equipment is low; mature equipment is not prone to faults, and stability and continuity of production are guaranteed.

The invention discloses a method for co-producing erythritol from trehalose mother liquor and sodium gluconate mother liquor. Belongs to the technical field of erythritol production. The invention discloses and provides a method for co-producing erythritol from trehalose mother liquor and sodium gluconate mother liquor, which comprises the following steps: adding the trehalose mother liquor and the sodium gluconate mother liquor into a fermentation culture medium, fermenting by using candida lipolytica, enabling the conversion rate of the fermented erythritol to be 70%, and simultaneously filtering by using different nanofiltration membranes, according to the method, the erythritol finished product is obtained, the trehalose and sodium gluconate mixed solution is also obtained, and the trehalose and sodium gluconate mixed solution can be added into fermentation liquor again after being dissolved, so that cyclic utilization is realized; the production efficiency is improved, and the cost is saved.

The present invention relates to the technical field of cefotaxime acid, and discloses a clean recovery process of cefotaxime acid mother liquor, wherein the mother liquor produced by preparing cefotaxime acid is filtered and treated by a nanofiltration membrane system to obtain a concentrated solution and a dialyzate; the concentrated solution is separated to obtain cefotaxime acid; the dialysate is pumped into the middle of a distillation tower through a raw material pump, and steam permeates to obtain high-purity ethanol. The pervaporation membrane device of the present invention dehydrates ethanol to a chemically pure level in one step, and has simple operation, high recovery rate and low energy consumption. After the clean recovery process, the purity of cefotaxime acid reaches more than 99.5%, and the purity of ethanol reaches more than 99.5%.

The present invention relates to a method for preparing crystalline xylitol, comprising carrying out xylose dissolution, hydrogenation, decolorization, chromatographic separation, ion exchange, concentration by evaporation, vacuum crystallization, centrifugal separation, drying, and sieving to obtain the desired crystalline xylitol. In the present invention, the conversion rate of xylose in the hydrogenation process is decreased from 99.8% to 95%, and the hydrogenation reaction time is changed from 2 hours to 1 hour for feeding; the resulting xylitol solution is further subjected to decolorization treatment and chromatographic separation treatment to increase the content of xylitol in a chromatographic extract, and the chromatographic extract is further subjected to refining treatment to obtain the desired crystalline xylitol; in addition, a chromatographic raffinate is recycled for the xylose hydrogenation process and is completely utilized.

The invention relates to the technical field of linalool synthesis, in particular to a decoloring and aroma-keeping method for synthesizing linalool, which comprises the following specific steps: S1, cracking generation: heating beta-pinene to high temperature, and cracking the beta-pinene to generate myrcene; s2, rapid cooling: rapidly cooling the split product myrcene to avoid side reaction; s3, crude sample generation: in the presence of an acid catalyst, myrcene reacts with water to generate linalool, the reaction temperature is 40-80 DEG C, and the reaction time is 4-12 hours; s4, neutralizing the crude sample: after the reaction is finished, neutralizing residual acid by using a sodium bicarbonate solution, and separating an organic phase by using a separating funnel; s5, washing the crude sample: washing the organic layer to be neutral, and removing water-soluble impurities at the same time; s6, purifying the crude sample: adding anhydrous sodium sulfate to dry an organic layer. According to the decoloring and fragrance-keeping method used in the invention, the synthesized linalool is easy to decolor and natural in fragrance, can easily meet the standards of food additives and spice supplies, and has a wide application prospect.

The acid removal system comprises a shift gas washing tower, a medium-pressure flash tower, a CO2 desorption tower, an H2S concentration tower, an N2 gas stripping tower, a thermal regeneration tower, a methanol-water separation tower and a tail gas washing tower which are sequentially communicated through a first pipeline, the lower end of the shift gas washing tower is communicated with a shift gas pipe which is communicated with the top of the medium-pressure flash tower through a second pipeline, and the top of the shift gas washing tower is communicated with a PSA hydrogen production device through a third pipeline; the CO2 desorption tower is sequentially communicated with the compressor and the urea production part through a fourth pipeline; the comprehensive automation level of the acid removal device can be improved, and the operation labor intensity is reduced; the operation stability of the acid removal device is improved, and the standard deviation of each key process parameter is reduced.

The invention discloses a production method of stable liquid aluminum isopropoxide, and belongs to the field of organic metal compound preparation. According to the method, an oxidation film on the surface of aluminum and water in isopropanol are removed through raw material pretreatment, and initial liquid aluminum isopropoxide is prepared in an inert atmosphere; the composite solvent is prepared by mixing a functional main solvent and a high-boiling-point auxiliary solvent in proportion, the addition amount of the composite solvent is 15-30% of that of the initial product, and the finished product is obtained through step-by-step stirring and mixing and precise filtration. Through double mechanisms of chemical coordination stabilization and physical volatilization inhibition, the problems of short shelf life and poor stability of the existing product are solved, the shelf life reaches 6-12 months, the purity is greater than or equal to 99.0%, the batch difference is less than or equal to + / -10%, and the preparation method has a good application prospect.

The invention relates to the field of preparation of high-end wet electronic chemicals for integrated circuits, in particular to an industrial-grade isopropanol purification method. The method comprises the following steps: carrying out dehydration and light component removal on industrial-grade isopropanol to obtain a light liquid phase and a heavy liquid phase; the light liquid phase is subjected to flash evaporation treatment to obtain a second liquid phase, and the second liquid phase is subjected to catalytic hydrogenation and then returns for light component removal; and the heavy liquid phase is subjected to heavy component removal. According to the invention, flash evaporation and catalytic hydrogenation are carried out on the dehydrated material sent into the light component removal tower, so that the recovery rate of the purified isopropanol product is greatly improved under the condition of ensuring the technical indexes such as product purity and water content.

The utility model relates to an MTO (Methanol To Olefins) concentrated water treatment device, which comprises a circulating liquid phase hydrogenation unit and a dehydration unit, aldehyde and ketone components in MTO concentrated water are converted into mixed alcohol through circulating liquid phase hydrogenation, and most of water in the mixed alcohol is removed through flash evaporation degassing, azeotropic distillation and zeolite membrane dehydration treatment. According to the MTO concentrated water treatment device, a mixed alcohol product with low water content (about 2wt%) and waste water with low alcohol content (less than 0.2 wt%) are obtained, the technical index of the obtained mixed alcohol product is higher than the national standard of alcohol-based liquid fuel GB16663-1996, and ethanol, isopropanol and 2-butanol products can be obtained through further separation. The additional value is also improved, and the purposes of improving the quality and improving the efficiency are achieved.